Use licenses from LAN ZOO to standalone licenses

We are using LAN zoo for our licenses, but now we want use standalone licenses on individual systems.
We have deleted licenses from LAN ZOO and tried to using on individual systems but it is still showing that license key is used in zoo server and name of our system where we have installed LAN ZOO.
Kindly suggest any solution on this.
We tried restarting both systems but couldn’t help.

The usual advice is to contact the Rhino sales office for your region.